calcium carbonate contains 40% calcium, 12rbon and 48% oxygen by mass. knowing that law of constant composition holds good, calculate the mass of the constituent elements present in 2g of calcium carbonate.

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Solution

The formula for calcium carbonate is CaCO₃
The relative atomic mass of calcium = 40
The relative atomic mass of carbon = 12
The relative atomic mass of oxygen = 16.

Calcium carbonate contain one atom of calcium, one of carbon and three of oxygen.
Thus the formula weight of CaCO₃ = 40+12+48=100.

So, calcium carbonate contains 40% calcium, 12% carbon and 48% oxygen by mass.

Since the mass of the constituent elements is relative atomic mass ( i.e the ratio of the average mass per atom of an element to one-12th the mass of an atom of carbon-12.) its is independent of weight of compound i.e atomic mass of calcium , carbon and oxygen remain same in 2 g also or also in any other weight too.

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